roll llvm to 7024b9e1b423b3c3c6ac76ab6a73cb2c9e4ef842 (#7781)

Updated patch 0006 to include new files added in
https://github.com/llvm/llvm-project/pull/207543.

Dropped patch 0009 which was upstreamed in:
https://github.com/llvm/llvm-project/pull/190088

Minor updates to patch 0011 for changes upstream.

Minor updates in export.cpp to use `llvm::FoldingSetInsertToken` instead
of a void pointer.

toolchain/check/cpp/export.cpp

@@ -192,8 +192,9 @@ static auto CreateClassTemplateSpecializationDecl(
           template_args,
           /*StrictPackMatch=*/false,
           /*PrevDecl=*/nullptr);
-  class_template_decl->AddSpecialization(class_template_specialization_decl,
-                                         /*InsertPos=*/nullptr);
+  class_template_decl->AddSpecialization(
+      class_template_specialization_decl,
+      /*InsertPos=*/llvm::FoldingSetInsertToken());
   class_template_specialization_decl->setHasExternalLexicalStorage();
   class_template_specialization_decl->setHasExternalVisibleStorage();
 
@@ -1451,7 +1452,8 @@ auto ExportFunctionSpecializationToCpp(
       context.ast_context(), template_args);
   function_decl->setFunctionTemplateSpecialization(
       function_template_decl, template_arg_list,
-      /*InsertPos=*/nullptr, clang::TSK_ExplicitSpecialization,
+      /*InsertPos=*/llvm::FoldingSetInsertToken(),
+      clang::TSK_ExplicitSpecialization,
       /*TemplateArgsAsWritten=*/nullptr,
       /*PointOfInstantiation=*/clang::SourceLocation());